An Individual Has a Karyotype That Is XX but Is

question 31

Multiple Choice

An individual has a karyotype that is XX but is phenotypically male. What could explain this result?

• A) The Y chromosome was not visible in the karyotype.
• B) Sex determination is determined by the autosomes and not the X chromosomes.
• C) A translocation has occurred, placing the SRY gene on one of the X chromosomes.
• D) The DAX 1 protein is overproduced.
• E) A nondisjunction event has resulted in Kleinfelter syndrome.

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